Bst900w Manual -

Ensure your input power supply is completely powered off before inserting wires.

Press and hold OK to activate output. Ensure target voltage is configured higher than input voltage. bst900w manual

PSM-BST900W DC-DC Boost Converter 900W LCD Display, Step Up Power Supply Module 8-60V to 10-120V Voltage Transformer Module Regulator Ensure your input power supply is completely powered

I can provide targeted troubleshooting steps for your exact setup. Share public link bst900w manual